121111221020101 has 4 divisors (see below), whose sum is σ = 130427468790892. Its totient is φ = 111794973249312.

The previous prime is 121111221020077. The next prime is 121111221020161. The reversal of 121111221020101 is 101020122111121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53692769176225 + 67418451843876 = 7327535^2 + 8210874^2 .

It is a cyclic number.

It is not a de Polignac number, because 121111221020101 - 2⁷ = 121111221019973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121111221020161) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4658123885376 + ... + 4658123885401.

It is an arithmetic number, because the mean of its divisors is an integer number (32606867197723).

Almost surely, 2^{121111221020101} is an apocalyptic number.

It is an amenable number.

121111221020101 is a deficient number, since it is larger than the sum of its proper divisors (9316247770791).

121111221020101 is an equidigital number, since it uses as much as digits as its factorization.

121111221020101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9316247770790.

The product of its (nonzero) digits is 16, while the sum is 16.

Adding to 121111221020101 its reverse (101020122111121), we get a palindrome (222131343131222).

The spelling of 121111221020101 in words is "one hundred twenty-one trillion, one hundred eleven billion, two hundred twenty-one million, twenty thousand, one hundred one".